<template>
  <div id="aCoursesList" class="bg-fa of">
    <!-- /课程列表 开始 -->
    <section class="container">
      <header class="comm-title">
        <h2 class="fl tac">
          <span class="c-333">全部课程</span>
        </h2>
      </header>
      <section class="c-sort-box">
        <section class="c-s-dl">
          <dl>
            <dt>
              <span class="c-999 fsize14">课程类别</span>
            </dt>
            <dd class="c-s-dl-li">
              <ul class="clearfix">
                <li>
                  <a title="全部" :class="{active:allIndex==1}" href="#" @click="getAll()">全部</a>
                </li>
                <!--index值的是索引，也就是id值-->
                <li v-for="(oneSubject,index) in oneSubjectList" :key="index" :class="{active:oneIndex==index}">
                  <a :title="oneSubject.title" href="#" @click="getTwoSubjectList(oneSubject.id,index)">{{oneSubject.title}}</a>
                </li>
              </ul>
            </dd>
          </dl>
          <dl>
            <dt>
              <span class="c-999 fsize14"></span>
            </dt>
            <dd class="c-s-dl-li">
              <ul class="clearfix">
                <li  v-for="(twoSubject,index) in twoSubjectList" :key="index" :class="{active:twoIndex==index}">
                  <a :title="twoSubject.title" href="#" @click="selectTwoSubject(twoSubject.id,index)">{{twoSubject.title}}</a>
                </li>
              </ul>
            </dd>
          </dl>
          <div class="clear"></div>
        </section>
        <div class="js-wrap">
          <section class="fr">
            <span class="c-ccc">
              <i class="c-master f-fM">1</i>/
              <i class="c-666 f-fM">1</i>
            </span>
          </section>
          <section class="fl">
            <ol class="js-tap clearfix">
             <li :class="{'current bg-orange':buyCountSort!=''}">
                <a title="销量" href="javascript:void(0);" @click="searchBuyCount()">销量
                <span :class="{hide:buyCountSort==''}">↓</span>
                </a>
              </li>
              <li :class="{'current bg-orange':gmtCreateSort!=''}">
                <a title="最新" href="javascript:void(0);" @click="searchGmtCreate()">最新
                <span :class="{hide:gmtCreateSort==''}">↓</span>
                </a>
              </li>
              <li :class="{'current bg-orange':priceSort!=''}">
                <a title="价格" href="javascript:void(0);" @click="searchPrice()">价格&nbsp;
                  <span :class="{hide:priceSort==''}">↓</span>
                </a>
              </li>
            </ol>
          </section>
        </div>
        <div class="mt40">
          <!-- /无数据提示 开始-->
          <section class="no-data-wrap" v-if="data.total==0">
            <em class="icon30 no-data-ico">&nbsp;</em>
            <span class="c-666 fsize14 ml10 vam">没有相关数据，小编正在努力整理中...</span>
          </section>
          <!-- /无数据提示 结束-->
          <article class="comm-course-list">
            <ul class="of" id="bna">
              <li v-for="course in data.records" :key="course.id">
                <div class="cc-l-wrap">
                  <section class="course-img">
                    <img :src="course.cover" class="img-responsive" :alt="course.title">
                    <div class="cc-mask">
                      <a :href="'/course/'+course.id" :title="开始学习" class="comm-btn c-btn-1">开始学习</a>
                    </div>
                  </section>
                  <h3 class="hLh30 txtOf mt10">
                    <a :href="'/course/'+course.id" :title="course.title" class="course-title fsize18 c-333">{{course.title}}</a>
                  </h3>
                  <section class="mt10 hLh20 of">
                    <span class="fr jgTag bg-green" v-if="Number(course.price)===0">
                      <i class="c-fff fsize12 f-fA">免费</i>
                    </span>
                    <span class="fl jgAttr c-ccc f-fA">
                      <i class="c-999 f-fA">9634人学习</i>
                      |
                      <i class="c-999 f-fA">9634评论</i>
                    </span>
                  </section>
                </div>
              </li>
            </ul>
            <div class="clear"></div>
          </article>
        </div>
        <!-- 公共分页 开始 -->
         <div>
          <div class="paging">
            <!-- 
              undisable这个class是否存在，取决于数据属性hasPrevious,当没有上一页的实现，就无法点击
             @click.prevent代表的是阻止该超链接的跳转，执行里面的方法
             -->
            <a
              :class="{undisable: !data.hasPrevious}"
              href="#"
              title="首页"
              @click.prevent="gotoPage(1)">首页</a>

            <a
              :class="{undisable: !data.hasPrevious}"
              href="#"
              title="前一页"
              @click.prevent="gotoPage(data.current-1)">&lt;</a>

            <a
              v-for="page in data.pages"
              :key="page"
              :class="{current: data.current == page, undisable: data.current == page}"
              :title="'第'+page+'页'"
              href="#"
              @click.prevent="gotoPage(page)">{{ page }}</a>

            <a
              :class="{undisable: !data.hasNext}"
              href="#"
              title="后一页"
              @click.prevent="gotoPage(data.current+1)">&gt;</a>

            <a
              :class="{undisable: !data.hasNext}"
              href="#"
              title="末页"
              @click.prevent="gotoPage(data.pages)">末页</a>

            <div class="clear"/>
          </div>
        </div>
        <!-- 公共分页 结束 -->
      </section>
    </section>
    <!-- /课程列表 结束 -->
  </div>
</template>
<script>
import courseApi from '@/api/course'
export default {
  data(){
    return {
      page:1, //当前页
      data:{},  //课程列表
      oneSubjectList: [], // 一级分类列表
      twoSubjectList: [], // 二级分类列表
      courseFrontVo: {}, // 查询表单对象
      oneIndex:-1,
      twoIndex:-1,
      allIndex:-1,
      buyCountSort:"",
      gmtCreateSort:"",
      priceSort:""
    }
  },
  created(){
    //条件查询方法
    this.pageQueryList()
    //查询所有的一级目录
    this.getAllOneSubjectList()
  },
  methods:{
    //初始化
    init(){
      this.page=1, //当前页
      this.data={},  //课程列表
      this.oneSubjectList=[], // 一级分类列表
      this.twoSubjectList=[], // 二级分类列表
      this.courseFrontVo={}, // 查询表单对象
      this.oneIndex=-1,
      this.twoIndex=-1,
      this.allIndex=-1;
      this.buyCountSort="",
      this.gmtCreateSort="",
      this.priceSort=""
    },

    //分页查询
    pageQueryList(){
      courseApi.getFrontCourseCondition(1,8,this.courseFrontVo)
      .then(response=>{
        this.data=response.data.data
      })
    },

    //查询全部
    getAll(){
      this.init()
      this.allIndex=1
      this.gotoPage(1)
      this.getAllOneSubjectList()
    },

    //分页跳转
    gotoPage(page){
      courseApi.getFrontCourseCondition(page,8,this.courseFrontVo)
      .then(response=>{
        this.data=response.data.data
      })
    },

    //查询所有的一级目录
    getAllOneSubjectList(){
      courseApi.getOneSubjectList().then(response=>{
        this.oneSubjectList=response.data.data.list
      })
    },

    //点击一级分类中的某一个，开始查询课程列表和查询所有相关的二级分类
    getTwoSubjectList(subjectParentId,index){//一级分类的id
      //选中一级分类之后，该颜色变色
      this.oneIndex=index
      //清空二级分类
      this.twoIndex=-1
      this.courseFrontVo.subjectId=''
      this.twoSubjectList=[]

      //查询当前课程,只查询一级分类
      this.courseFrontVo.subjectParentId=subjectParentId
      //跳转到首页
      this.gotoPage(1)

      //从一级分类中查询到二级分类
      for(var i=0;i<this.oneSubjectList.length;i++){
        //所有的一级分类
        var oneSubject= this.oneSubjectList[i]
        if(subjectParentId==oneSubject.id){
          this.twoSubjectList=oneSubject.children
        }
      }
    },

    //查询二级分类
    selectTwoSubject(subjectId,index){
      //点击的二级分类生效
      this.twoIndex=index
      //查询条件变更
      this.courseFrontVo.subjectId=subjectId
      //跳转到首页
      this.gotoPage(1)
    },

    //销量进行排序
    searchBuyCount(){
      //样式生效
      this.buyCountSort="1"
      this.gmtCreateSort=""
      this.priceSort=""

      //变更查询条件
      this.courseFrontVo.buyCountSort=this.buyCountSort
      this.courseFrontVo.gmtCreateSort=this.gmtCreateSort
      this.courseFrontVo.priceSort=this.priceSort

      //跳转到首页
      this.gotoPage(1)
    },
    //更新时间
    searchGmtCreate(){
       //样式生效
      this.buyCountSort=""
      this.gmtCreateSort="1"
      this.priceSort=""

      //变更查询条件
      this.courseFrontVo.buyCountSort=this.buyCountSort
      this.courseFrontVo.gmtCreateSort=this.gmtCreateSort
      this.courseFrontVo.priceSort=this.priceSort

      //跳转到首页
      this.gotoPage(1)
    },

    //价格
    searchPrice(){
        //样式生效
      this.buyCountSort=""
      this.gmtCreateSort=""
      this.priceSort="1"

      //变更查询条件
      this.courseFrontVo.buyCountSort=this.buyCountSort
      this.courseFrontVo.gmtCreateSort=this.gmtCreateSort
      this.courseFrontVo.priceSort=this.priceSort

      //跳转到首页
      this.gotoPage(1)
    }

  }
};
</script>
<style scoped>
  .active {
    background: hsl(152, 66%, 39%);
  }
  .hide {
    display: none;
  }
  .show {
    display: block;
  }
</style>